Improvement in saw-frames



diluted tates @met @twine DANIEL MOORE AND EDWIN MOORE, OF BROOKLYN, E. D., NEW

YORK. Y

, Letters Patent N o. 94,500, dated September 7, 1869.

IMPROVEMENT IN SAW-FRAMES.

The Schedule referred to in these Letters Patent and making part ofthe same.

'and exact description of the said invention, reference being had to the annexed drawing, making part of this specification, wherein- Figure l is a side view of a saw-frame fitted With our improvement, a portion of one of the handles being in section; and

Figure 2 is a horizontal section at one of the joints.

The same parts are indicated by like letters.

Saw-trames are exposed to the strain of the saw and t`o the racking motion resulting from the movement of the saw in use. A stretcher has heretofore been employed between the side frames to' keep theln apart, and a rod and screw-shackle to tighten the saw.

Our invention consists in arch-shaped stretchers set withthe convex sides coming together, and inserted between the end pieces of the saw-frame, so that the act 0f drawing the upper ends of the saw-trames toward each other, in tightening the saw, shall act to force the stretcher next the saw into a less curved form, thereby spreading the frames at the saine time that the arched st-retchers brace and stifen the frame against the racking motion to which it is subjected in use.

In the drawinga represents the handle-portiowof the saw-frame; f

b is the opposite portion of the frame;

c, the saw; and

d is a tight-ener for drawing the upper ends of the saw together. This tightener is shown as made `of rods, 2 2, with looped ends passing into nlortises in the upper ends of the frames (t b, and these rods, 2.?, have right and left-hand screw-threads on them taking rthe screw-shackle 3.

Our stretcher, f, is ina-de with rounding ends as seen at 4, setting into correspondingly-shaped recesses in the faces or inner edges of the frame a l, and theft-enons and inortises are also rounded as shown.

This stretcher, f, is n xade as an arc of a circle or a toggle, and the-straining of vthe saw is et'ected by forcing the stretcher j' into a more nearly straight form, and thereby increasing the distance between the joints at 4,

The counter-stretcheng is attached near the middle to the stretcher j', and the ends enter rounding recesscs in (o and b.

These stretchers, 1" and g, forni arcs of circles, the convex sides coming ltoward each other; hence, when the tightener d draws the ends of g together, and

makes the saine the are of asmaller circle, the stretcher f will be forced into a more nearly straight form, and spread the frames a b, straining the saw.

What we claim, and desire to secure by Letters Patent, is-

The stretcher f, formed as an arch, and united to the inverted arched stretcher g, in combination with the frames a b, and tightener (l, as and for the purposes set forth.-

In witness whereof, we have hereunto set our signatures, this 17th day of June, A. D. 1869. DANL. MOORE. EDWIN MOORE.

Witnesses:

Unas. H. SMrrH, Geo. T. PINCKNEY. 

